每隔三四年，条件适宜时，湖面上就会布满火烈鸟，它们停止飞行开始繁殖。
Once every three or four years, when conditions are right, the lake is covered with the pink birds as they stop flight to breed.
如果气温下降到零下60度以后，我们就停止飞行，但是没有多少天会那么冷。
If the temperature dropped to 60 degrees below zero, we could not fly, but there were not that many days that the temperature was that low.
当协和飞机停止飞行时，航空爱好者将获得另一个可以欣赏的展览品。
Aviation fans are going to have another spectacle to enjoy when Concorde stops flying.
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